The Gruža (Serbian Cyrillic: Гружа, pronounced [ɡrûʒa]) is a river in central Serbia.

[1] The Gruža originates in the central part of the Rudnik mountain, right under the mountain's main settlement, the village of Rudnik, northeast of the town of Gornji Milanovac, central Serbia.

After the villages of Oplanić and Dragušnica, the river enters the depression of Gruža, a main part of its valley, situated between the mountains of Kotlenik (on the west) and Gledićke planine (on the east).

The Gruža receives the left tributary of Kotlenjača and continues to the south next to the villages of Balosave, Guberevac, Itkovac, Milavčić and Vitanovac, before it enters the West Pomoravlje region and empties into the Zapadna Morava near the village of Čukojevac.

The Gruža drains and area of 617 km2,[2] belongs to the Black Sea drainage basin and it is not navigable.